Water-based drilling fluid for protecting fractured reservoirs, and preparation method and use thereof
US10392552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2017 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Nov 10, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/34
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the technical field of petroleum drilling, and discloses a water-based drilling fluid for protecting fractured reservoirs and preparation method and use thereof. The drilling fluid includes: bentonite, a tackifier, a diluent, a filtrate reducer, an anti-collapse agent, a reservoir protectant composition, a lubricant, and water, wherein, the reservoir protectant composition comprises at least one of a polymer elastic granule, a synthetic fiber and a film former; the polymer elastic granule comprises an intermediate product, an alkali, a salt, and water in specific contents; the intermediate product is prepared from raw materials including acrylamide, a cationic monomer, a cross-linker, an initiator, a toughener, and water in specific contents. The drilling fluid provided in the present invention has a temperature-resistant property up to 200° C. or above, achieves a high temporary plugging success ratio, has a unidirectional plugging characteristic, and attains an outstanding reservoir protection effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.